Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
xa tinh » va tinh, ha tinh, ca tinh
ly hang » ly quang
lo hang » le hang, cho hang, le thang
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa
va cam » va cham, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((lo hang) or (ly hang)) va hoi. hieu ((va cam) OR (va cac)) tuc xa tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((lo hang) OR (ly hang)) va hoi. hieu ((va cam) OR (va cac)) tuc xa tinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((lo hang) or (ly hang)) va hoi. hieu ((va cam) OR (va cac)) tuc xa tinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((lo hang) or (ly hang)) va hoi. hieu ((va cam) OR (va cac)) tuc xa tinh vai cua tre*.